Love our new GC but hey what is that sloshing sound? I realize the larger gas tank is about square under and accross the back half of the vehicle but why am I hearing a profound liquid in motion sound, when driving, ESP. Backing up from a clean start. Even with a full tank...anyone?

i had this problem, drove me nuts. for me it was about 4" of water under the driver seat. if you have rubber floormats, pull them up and see if the carpet is wet. i pulled my seat, the carpet and plastic floor board out and there is was. i pulled the drain plugs and dried it out with a towel.